Tech Tips – Using Tuff Torq Repair Kits

Tips for Tuff Torq Repair Kits

(K46, K57, K574, T40 MODELS)

The Tuff Torq service team has put together this summary outline procedure for using our Tuff Torq repair kits to service your drive system. These are just tips and should not be considered a complete repair guide for every issue you might have. All repairs and maintenance of our drive systems should be performed by a professional service technician. If you have any questions or need specific help for your issue, feel free to contact our service team at (866) 572-3441 or through the website by clicking here.

Receive the correct repair kit

  • First, clean the outside debris from the unit.
  • Be sure to locate the proper serial number of the TTC unit (Located on the barcode sticker).

Removing unit for repair

  • After you have received your parts, please inspect the parts. Note the mating surfaces must be smooth and clean.
  • Repair Kits generally include the center case, pump cylinder block, motor cylinder block, filter, o-rings, seals, and sealant. When repairing your unit, it may not be necessary to use all o-rings, and seals.
  • Drain the oil from the unit. (DO NOT reuse the oil) Remove the flat rubber seal cap located under the fan to drain the oil. No need to remove the vent valve.
  • Place the unit on your workbench with the fan facing down.

Opening unit an performing repair

    • Remove the case bolts and remove the lower housing.
    • Scrape the sealant from both the upper and lower cover. Be careful not to damage the sealing surface while scraping the housings. (Remove all sealant completely)
    • Now is the time to use the drawing and parts list from TTC’s website to identify everything inside the unit
    • Clean and flush the unit. Improper cleaning of the unit could result in a premature failure or void the parts warranty. You can clean internal parts with standard brake cleaner.
    • If you choose to inspect any parts make sure these parts are placed back into the proper orientation. (Ex. If you remove a bearing or a plate make sure that it is placed back into the proper position. Plate with smaller ID (INSIDE DIAMETER) should contact Pistons.) The notes are listed on most drawings so be sure to follow these tips properly. (see Fig#1)

      Using Tuff Torq repair kits - Figure 1

      Using Tuff Torq repair kits – Figure 1

  • Note the original position of the Motor Housing. (see Fig.#2)
    Using Tuff Torq repair kits - Figure 2

    Using Tuff Torq repair kits – Figure 2


  • Once you are ready to install the parts be sure to coat the mating surfaces with oil. This will help lubricate the contact surfaces.

Re-assembly of unit

  • Make sure to re-install the bypass pin and washer from the original center case and motor cylinder block. You can use a light amount of automotive grease or Vaseline to keep these two parts in position while putting the parts back in.
  • If the unit has IDS valves, be sure to note the correct position of the ball or the filter compared to the drawing (see Fig.#3).
Using Tuff Torq repair kits - Figure 3

Using Tuff Torq repair kits – Figure 3

  • New center cases will have pilot holes for the IDS system. See figure 4 to understand the difference between IDS and non-IDS units. The non-IDS unit will not have finished machining at the pilot holes. This is simply in the case mold design of the new center-case and does not impact the performance of your unit.
    Using Tuff Torq repair kits - Figure 4

    Using Tuff Torq repair kits – Figure 4


  • New style magnet holder and two magnets (see Fig.#5 on back) for proper orientation.
Using Tuff Torq repair kits - Figure 5

Using Tuff Torq repair kits – Figure 5

  • After re-installation, check to see if everything will rotate freely.
  • It is critical that the operator maintains proper oil levels at all times.
    • Maintain oil level  at 20~25 mm (3/4”~1”) below the lip of (black cap) the filling port.
    • Always check oil level when the oil temperature is at room temperature (20C or 68 F).
    • When replacing oil in your unit, Tuff Torq Corporation recommends using Tuff Torq Tuff Tech™ hydrostatic drive fluid when rebuilding Tuff Torq transaxles. (DO NOT use ATF Automatic Trans Fluid)

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  • kevin mcfarlad says:

    I just finished installing my k46A trans and working OK I never liked the speed of this tractor (LTR180) the problem is cannot get to trans mision to clean because of the shoot (center rear discharge) I’ve read that the k66 trans would not fit my tractor, but can I fit the k66- pump, motor, wash plate, shaft, charge pump… into the k46 trans?

  • Jarod says:

    I’m working on my K46BT, serial number 46BT1060678. TT # 7A646084181. I thought I had taken pictures of everything before I disassembled everything.. Well, I must not of and I can’t remember the orientation of the motor drive block. I can’t remember if it was thick side up or thin side up. Any help would be appreciated.

  • Rachael says:

    HI I’m looking for a tough talk diff rebuild kit please

  • Travis Woltmann says:

    I am looking for a rebuild kit for a k57 on a 2007 simplicity Broadmoor , do you have one available and a part number?

  • Jeff says:

    Do you have a rebuild kit for JD LA-130?

  • Kevin R Cotter says:

    I had a local guy change the oil on my K46/T40 (John Deere LA135) hydro this spring. Ever since I got it back it rides really rough when cold and goes really slow in reverse. After it warms up it starts to run much smoother, and it actually speeds up in reverse.

    • ggraham says:

      Sounds like the Oil the dealer put in is a little thick. You might want to warm it up a little before hitting the mowing real hard.

  • Kevin Carswell says:

    Have a husqvarna LT 2654 with k46. 46bn0044004, need correct hydro diagram. Thanks

  • Chin Yew Law says:

    I am looking for the seal kit for 7a646084100. Can you recommend which kit to purchase?

  • Tyler says:

    I have a Husqvarna LGT2554 with the K46 with the S/N: 46AW0002255. I can’t find the rebuild kit on the site, could you help? Thanks

  • Kenny says:

    I have a z425 54 inch John Deere need left side transmission repair kit thanks

  • D Thomas says:

    What overhaul kit suits k46. S/n 40J-0833205 please ?

  • John Krebs says:

    What is the repair kit # for a 768T2024011 trans axle transmission

  • Dennis Henley says:

    I have a John Deere L118 maybe 2004, with Tuff Torq 7A646024380 SN 46V-0278552
    iv’e taken it out because it was getting weak pulling up inclines, especially when hot. What are my options as to rebuilding this unit, kits or any upgrades? and estimate for cost of options. This unit has never been worked on as I have owned it since new and I will be doing the work myself . Thanks for your advice

  • R.Buxton says:

    I have a K51B.can I replace the bypass shaft seal ( o-ring ) from the top without disassembly of the meaning when I remove the pin and lever will the shaft fall into the gear case?

    • ggraham says:

      This really depends on the serial number brake of the transmission. Early versions have a lever that is not removable. If it is a later version then, yes you can remove the lever. The shaft is spring-loaded and will sink into the transmission but not all the way inside. You should be able to remove the O-rings with a pick and clean the area well to ensure that the new o-rings will seal off the transmission. Once installed use a small metal ruler to hold the shaft in the up position so you can put the lever on the shaft and start the roll pin. Make sure not to note the position of the lever so you get it installed correctly and not turn the shaft inside the transmission.

  • Michael k morreim says:

    I have a 7A646084020. SN57R0019816. HOP pn 437814. I can go forward and back wards at low speed but when I try to go faster it lurches and makes a loud clicking noise, I think we overloaded the pull behind trailer and broke some thing,,,do you have a rebuild kit for this unit, thank you in advance

    • ggraham says:

      I would check the mountings on the frame for the transmission. It sounds like the transmission is not “locked” into place and is “flexing”. Probably just enough that the belt is not coming off. Husqvarna has a kit to fix this and you should contact them if that is what is going on.

  • Morgan Jenkins says:

    Hi, I have a K574 (787Q0323030 S/N 574C-003694) & HFWD when warm it is very slow going forward and will not go up an incline, strangely in reverse it is fine. I suspect it needs a rebuild but not sure because it’s okay going in reverse. Can you advise?

    • ggraham says:

      The Hydrostatic transmission can start to act strange when there is damaged hydraulic parts. It can work fine in forward and have issues in reverse and vice versa. First I would check to see if the transmission has a shock absorber attached to the control lever. Sometimes the OEM will add those to the transmission and I would check for that. When the shock absorber goes bad it does not allow the control lever to move its whole arc and that will slow the transmission down because it is not building enough oil pressure to overcome the incline and/or the weight of the tractor.

  • D Thomas says:

    I have a tuff Torq 7681202401 which has just started to have trouble driving. I notice the rubber cap under the fan is leaking (Perished). First thoughts were to replace the cap and the oil. S/N 40J-0833205. Having trouble finding a replacement cap. Could you please advise.. ? Thanks.

  • John LaRese says:

    I have a Tuff Torq 7A646024021 s/n 46C-0124770 and am looking for a rebuild kit part number to order. Also how do I find out what parts are included in the kit?

  • John Williams says:

    K46 Rebuild Kit

    • ggraham says:

      The repair kit is model specific and sometimes even serial number specific depending on the model. So, I would need the serial number of the unit to get you the correct repair kit.

  • Jim Socha says:

    I have a K46 in a 2013 John Deere with 140 hours on it that has broken springs under three of the 5 pistons. I took a fourth spring in my fingers and it snapped like a pretzel would if you tried to bend it. There is no visible scoring or discoloration that would indicate overheating and makes me wonder if there was a bad batch of springs from your supplier. How do I order all 10 replacement springs and what are their p/ns? My axle info is Model: 768T2024011 S/N: 40J-1320433

    • ggraham says:

      I am sorry but the springs are not sold separately. We receive the cylinder blocks complete. Also, the cylinder blocks are locked into the repair kit and are not able to be purchased outside of that kit.

  • Bob says:

    I have a John Deere Lt160 with a Tuff Torq K46C Serial # 46C-0077400 Transmission with 2000 hours on it. I all of a sudden lost all drive. The belt and pulley on top of the transmission are good. It makes no noise and you can push the tractor freely like you have disengaged the transmission. Also the pedals feel soft.

    • ggraham says:

      I would check the linkages first. make sure they are working properly and not bound, bent or broken. Also, check for debris on the transmission not allowing the linkage or the control lever to move properly.

  • Dave says:

    Hello I just got a riding mower with a 46BA hydrostatic, the plunger in the back to roll freely was in the locked position, once i got it home I unlocked the plunger to roll freely, after I started the mower, I engaged the plunger the mower did not move, took the unit off drained fluid, was not full, took the cover off, didn’t find anything broken or out of place! I seems the plunger or mechanism to to lock the wheels from free roll may be the problem.
    I can’t find any references or picks to show that part!

    • ggraham says:

      To help with parts I need the serial number of that transmission because that series is serial number specific for parts. The serial number is on a bar code sticker that is on the case of the transmission close to one of the axles.

  • joseph says:

    Hello have k46 BE once warms up reverse is slow and won’t go over 2×1 hump into shed , forward is much better no problems after 5w50, taken apart second time to check pump and motor little chater on aluminum face but found ids with filter seized , can this be reducing pressure or loss of pressure, will polish the pump and motor contac on center case pump and motor no scores or wear visable

    • ggraham says:

      I do not believe an IDS valve is your problem. I think the faces of the center case are the issue.

  • Robert says:

    Looking for parts diagram for K574 4wd, lost all drive ?

  • Rich Rankin says:

    I have a Husqvarna 2654 riding mower with a Tuff Torq 7A646084161, SNBN8068484 transmission. I need to replace the broken left axle… I cant find a part number for the new left axle in your parts search. Can you help?

    • ggraham says:

      The axles are offered in the axle shaft kit. the kit comes with both axles, 2 axle seals, sealing cap, filter, gasket material, and 3 liters of our tuff tech oil. It is #202 on the parts list and the part number is 1A646099891.

  • Raymond Niessen says:

    I have a John Deere L130 automatic and I need to either replace or rebuild my k46 hydrostatic transaxle and was just wondering how much your rebuild kits are and I also need a new fan and plug where the magnet goes.

  • Rod George says:

    I have a JD LA 165 with a K46 Tufftorq. The barcode for proper parts ID is gone. Is there another way to finding this info?

    • ggraham says:

      Yes, there is! you can contact a John Deere dealer with the serial number of the tractor and at the very least they can give you the part number for the transmission if not the serial number of the transmission.

  • Stephanie says:

    I have a craftsman riding lawnmower with the k46bt tuff torq hydrostatic drive the shifter lever seems to be not in gaging and it falls out of the hole was just woundering what part i need to fix problems

  • Joel Cloud says:

    Hi, I have a JD D140 replaced the transmission oil tractor will barley move. I found the fan on the transmission will not move. Not wishing to replace the entire transmission and hopefully don’t need the $450.00 plus repair kit.


  • Thomas Murphy says:

    I am looking for a rebuild kit for a K51. The S/N tag on the transaxle is missing, but it is from a Late 2001 Simplicity Broadmoor 16H Model 1693840, Simplicity Transaxle P/N 1720876SM.

    • ggraham says:

      That Simplicity number translates to a K51F. The part number for the rebuild kit is 19216899461.

  • Clifford everts says:

    And is that the fluid that goes in a k62?

  • Clifford everts says:

    How do I order the tuff torq tuff tech hydrostatic drive fluid?

  • Leon Roberts says:

    I have a John Deere Z425 with a model DUP10E sn#10e070213 is there a rebuild kit for this ? It locked up?

  • Todd Harris says:

    trans not operational; removed from mower, gears look great, what do I look for that rendered this unit to be non-operational??

    • ggraham says:

      Well, if it is a hydraulic issue check the faces of the part held in with three bolts called the center case. look at the area on it between the kidney ports. you are looking for scratches or scoring anything that is not glassy smooth allows oil to escape pressure. Also, check the mate up surface n the cylinder blocks and again look at the metal between the kidney ports looking for the same kind of thing. that is the usual wear on a K46.

  • Bob Griff says:

    i bought a used John Deere zero turn Z525E , 200 hours , mowing climbing a slope the right hydro static transmission failed , and since then having great difficulty repairing it , the only way i found is to buy a new transmission which costs $950 and with installation and taxes will cost me $1400. it is a very high price to fix a like new lawn mower , any help any suggestions is very appreciated

  • Michael says:

    I bought a John Deere L118 unlimited ran good when I bought it I got it home an my yard has a slope an it started an mowed fine Then it was sluggish on the slope an stopped pulling then just started to sweak like a power steering pump on a car would when it’s low so I had a guy look at it he said changing the fluid would help so I got the stuff an he changed it an within minutes of mowing it started the same thing new belts an new fluid. Is there a tranny that could replace mine or what the cheapest to do thanks in advance

    • ggraham says:

      There is a bar code sticker on the case close to one of the axles that has a serial number on it. Get the serial number and I can get the link to that transmission.

  • Lee Smith says:

    Hello, I bought a used jd155C with about 400 hours on it. After about 20 hrs of use, the tractor just stopped and the drive belt was slipping on the motor pulley. Acts like I have frozen hearing someplace. Can this granny be rebuilt?

    • ggraham says:

      Yes, I believe it can but to be sure I would need the serial number off the bar code sticker on the case of the transmission. It is close to one of the axles and normally you can see it from the rear of the tractor. Get the serial number and I can get you the link to your transmission

  • Philip says:

    Hello. Replacing axles & seals on K 46. Do I fit the seals first and push the axles through or do I put in the axles first and put the seals on over the axles putting tape on each end to protect seal.

  • Tabitha says:

    Hello. I have a john deere la150 with a k46
    After 20 mins of use it won’t go fwd or reverse and loses power up the hill when it will drive. After letting it sit for about an hour it will go again for a bit then loses all power again. What parts do I need?

  • Phil says:

    Please advise on price of a repair kit for a K46 transmission pumps seals filter ect

  • Robbie Hines says:

    Requesting a rebuild kit for a John Deere LA135 T40 hydro transmission. I hear the k46 is similar and will be utilized as a rebuild kit. Could I please get a quote? Thank you!

  • Tom Kelley says:

    I am looking for a K46C center case only are they still available and how do I order one if available

    • ggraham says:

      Center cases are only offered in the repair kit. You would need to get the whole repair kit for the transmission to get a center case.

  • Jim Sinnesael says:

    Hi I’m in Canada and I’m trying to find parts for my T40 hydrostatic trans. But when I go on web site it says not available.

  • Gregory Johnson says:

    Just replaced the pump bearing shaft and drained old oil. My John Deere dealer recommendations putting 10W-30 in for replacement oil. Is that ok or is a special Oil for hydrostatic transmissions?

  • Dan Sanders says:

    Gus varna LGT 2554.
    This is the 3rd right axel that has broken. They last about a year. K46. Kit # 1A646099891 fits. Can I just just the right axel. If sitting on the mower it is the axel on my right.

  • Dave Harders says:

    I am not remembering the orientation of the motor housing as stated above. Wide end up or down. Wondering if you could help me out. I have K46A S/N 46A-0036709 and JDHW p/n AM130447. Also would like to get a new filter, what kit would I need to order. Thanks

  • Joe Beatrice says:

    Tractor Tuff Torq AM135071 K62 Hydro Transmission. will this work in a John Deere G100 that had a K66 in it

    • ggraham says:

      I am sorry but since the transmissions are built specifically for the tractors that they are installed in I cannot recommend you swap for another unit.

  • Donald says:

    I just received a rebuild kit .
    The center section says T40 R14 and my old section has K46 R14 . Did I receive the correct parts ?
    Small difference in the one pump hole is the only difference .

    • ggraham says:

      It could be correct. However, for me to be certain I need the serial number of your transmission and the part number of the kit you ordered.

  • Marcus C says:

    Hi I have a k62g and it has lost all drive. Do you sell the repair kit for it as I can’t find one anywhere in the UK or Europe

    • ggraham says:

      There is a te build kit for the K62G. You would need to contact our distributor for the UK to order.
      Units 8-9 Flitch Industrial Estate
      Great Dunmow, Essex, CM6 1XJ
      01371 875331
      01371 874777 (fax)
      Contact: Phil Brown
      Countries Served: England, Northern Ireland, Scotland, Wales

  • Jilson litwin paterk says:

    Qual viscosidade do óleo e posso usar? Pois não consegui encontrar o óleo tuf torq!

  • Trevor Pollock says:

    I wanted to buy TUFFTORQ K46 IDS FILER KIT.
    While servicing K46 transmission I had several bits on a rag,cleaned & ready for fittment.One of the pups has ran off with the rag & lost 1 of the IDS filters,I have spent nearly 2 hours looking for it with no luck.I live in Australia & they are not available, even from my JOHN DEERE dealer🤐.
    Can you send the 2 filfers if you can as the spring & body are fine.
    Just let me know how to pay you for the filters plus shipping to Australia.
    My addresss is as follows,
    Trevor Pollock,
    681 Branxholme Road
    Victoria, 3286.
    Much appreciated,

  • Todd A Boulanger says:

    Can I order parts from you directly
    I have a Husqvarna transaxle
    Tuff Torq 7A646084180
    S/N 46BT0189876

    I need the Piston assembly for the motor and the other piston assembly
    Oil fill cap and breather
    gasket sealant

    Thank you
    Todd Boulanger

    • ggraham says:

      Yes, you can go right to the website and order right from there. once you create an account you can go int that transmissions a K46BT and get into the correct serial number break for your transmission and then you will be able to add things directly to a cart. It is unfortunate but the cylinder blocks come to us complete, we do not have the parts for them. and to get a cylinder block you have to get a repair kit.

  • Michael McLaren says:

    I have a husqvarna 18542 with the tuff torq k46 bt 462120 that just had the anti debris kit and inversion system replaced what are these and how do I find them in case I need to replace them in the future?

    • ggraham says:

      Those seem to be only offered through Husqvarna. I do not have any information on them. You would need to contact Husqvarna for where they are.

  • Vern Bagley says:

    i have 3 late model Simplicity Broadmoors one has a k62 tuff torque and the other 2 has tuff torque k57’s in them.why are these going out to the point where they won’t move forward or backwards a couple of them move then when it gets warm its slows to a crawl to the point i cannot make it back to the garage,they all have the cooling fins on the fans,there is no obstruction for them to not cool the transmissions,i do not have hills in my yard,and i just cannot believe i’m having a problems with all 3 and another thing they have good drive belts as well please get back to me on these issues,Thanks

    • ggraham says:

      That does seem odd. how many hours do you have on these tractors? Also when was the last time you changed the oil? perhaps starting with an oil change can shed light on what is going on.

  • Rene says:

    Hi my name is Renee I have a John Deere tractorl130 will notmove forwardnot revers

  • RIchard Ortiz says:

    Hello I have a k46 transaxle that is only two years old. The tractor craftsman 7800 pro series will not move forward not reverse., please advice in which parts I will need. I don’t believe I need a rebuild kit.

    • ggraham says:

      I am sending a checklist to your email. It should help you find our the issue and then you can determine which parts you will need based on what you find.

  • Bernie Yarmuch says:

    Just wondering if I can change (k46) the IDS from balls to screens without any issues?

  • Arlyn Burns says:

    Do you have a overhaul kit for?7A646024021 46C0174436

    • ggraham says:

      I am sorry but since that is a John Deere Transmission and John Deere wants to service their own transmsmions I have to send you to a local John Deere Dealer or you can contact the John Deere tech Center at 800.537.8233.

  • jeff says:

    I have the D130 JD with the 768T2024011 transmission. The machine will no longer engage the transmission when the tow valve rod is pushed in. Whether in or out the machine will free wheel. Can you give me some info on how to repair this situation?

    • ggraham says:

      I am sorry but I need to refer you to Your local John Deere Dealer or you can call the John Deere tech center at 800.537.8233.

  • Thomas Carver says:

    rebuild kit for Tuff Torq 787Q0824011 sn 7D-R0123131

    • ggraham says:

      I am sorry but I have to refer you to your local John Deere Dealer or you can call the John Deere tech center at 800.537.8233

  • Richard Bettmeng says:

    Do you repair transaxles in house?

  • Ryan says:

    Hi, I am trying to replace the shaft and pulley on my k51a tuff torq transmission.
    . However when I pulled the old shaft out and tried to reinsert the new shaft there are 2 cylinders in the way. I can push them down and they seem to be spring loaded.

  • Nicole Juhase says:

    Have husqvarna lgt2654 with a tuff torq 7A646084091 S/N 46AW0065780 we need to know how to get the cap off to drain, repair, and fill with fluid. How do I get a repair kit?

    • ggraham says:

      A slotted screwdriver inserted under the lip of the sealing cap should be able to pry up on it and remove the cap. to get a repair kit you can go to the website and once you create an account you can order the repair kit off the website.

  • Wayne Bizzaro says:

    Do you make a rebuild kit for a john deere gx255 it says Tuff Torq 7A637024020 71C-0000209 JDHW P/N AM133221

  • Dan says:

    i have a craftsman with the k46 transaxle itook it apart too replace a bad bearing n ow foward igoes reverse what can i do too fix this problem

    • ggraham says:

      You have installed the motor housing upside down. You need to flip that wedge-shaped part that holds the bearings for the motor cylinder block around 180 degrees.

  • Gerald Smallegange says:

    Hi, I have just refurbished my K46 transmission and replaced the pump, motor and gears. After I had it all back together I notices a small O ring on the bench and I have no idea where it came from. I looked at the assembly diagram and could not figure out where it may go. Can you provide any details on where the O ring needs to be. There are many O rings in the refurbishing kit but it says they do not need to be replaced. The one on my bench was like the the smallest one in the kit.

  • Scott mccann says:

    hi there, I have a mountfield 4155h 4wd ride on, the customer has been operating it on 2wd because hes been told the other axle needs replaced.Is there a way for me to identify this axle is beyond repair or can they all be repaired in some way.I don’t want to go just buy a new axle if it can be repaired? many thanks in advance

    • ggraham says:

      There should be a bar code sticker on the case of the front transmission that would have a serial number on it. That will tell you which transmission it is. When you get that number you can email it to and the helpful techs in the service department will get you the information you need.

  • Vaughn Pretorius says:

    Hi, can forward and reverse be swapped around by installing the motor housing other way round?

    • ggraham says:

      Yes it can. However, some transmissions have a valve installed in the centercase to restrict the flow of oil for reverse, thereby making reverse slower for safety reasons. If you have a model that is configured that way forward will be slow and reverse faster when you flip the motor housing.

  • James Cardinale says:

    Do you have a rebuild kit for a 46Z transaxle

  • Joseph Baldwin says:

    Nevermind, I figured it out. After taking a break and clearing my head, I took another look at it. What happened was that when I tried to pull out the original axle seals, I pulled the rubber away from the metal band insert that gives the seal it’s shape and rigidity. That’s why it seemed like it was melted or glued on. Because it was at the factory where it was molded. With a little more force I was able to get that metal band out and was left with a nice clean opening for the new axle seals to go into. Sorry about all that. Maybe you could remove my previous post? And this one? Since it’s a non-issue. Thanks Again. Sorry for wasting your time.

  • Joseph Baldwin says:

    Trying to replace the axle shaft seals on my K46BE. S/N 7A646084120. The seals (#72 187T0134280) that came in my repair kit (1A646099601) will NOT FIT in the original housing. Removing the originals was nothing like any of the repair videos I’ve seen. They almost seemed glued or melted to the housing. Took a lot of careful scraping to get all the old material off of housing. The chamfered opening is the exact diameter of the new seal, but the just inside the housing is what looks like a pressed in bushing. Part # 74 168T203424. So the new seal is so thick, that it bottoms out against that bushing before it comes anywhere close to properly being seated. Are the wrong axle seals being put in the repair kit? Should I remove the bushing? Which appears to have been pressed in anyways. (Doubt it. Also, don’t know how one would go about removing it anyway.) Also on the original seal….did you guys use some type of sealant between the outer circumference of the axle seal and the inner walls of the housing? Seriously, it was like the old axle seal was almost melted or glued to the housing. One other simple question. What does the acronym IDS mean? I.E. Ball IDS/Filter IDS Thank you for any help that would shed some light on this.

  • Michael Perry says:

    Don’t want to put that much money on this job just want the $71 cylinder block repair & the transmission seal service kit what is item # thanks 🙏

    • ggraham says:

      I am sorry but the cylinder blocks are locked together with the center case in the repair kit. You have to get the whole kit. without changing the center case you risk the cylinder blocks starting to conform to the wear on the machined face of the center case and then after a short time, you will be in the same predicament as you were in before.

  • Michael Perry says:

    I have 125Automacic 100series JohnDeere
    Prod. #GXO125A054310 model G125A
    Transmission Tuff Torque # 768T2024010 AM1344582 will barely move forward or reverse Could you tell me what differential gear kit, filter, magnets with holder, and cylinder block kit I need. If i could get the parts numbers to order them. Thank You Happy New Year

    • ggraham says:

      The differential gear kit is part number 1A646031570. The filter and cylinder block are in the repair kit which for that transmission is part number 1A646098280.

      • Michael says:

        Would that be all I need to order to rebuild including the center case for my Tuff Torq 768T2024010 sn-40J-0097949 it slow moves forward & reverse;

        • ggraham says:

          With what you are describing I think it is likely a hydraulic issue and the repair kit will replace the worn hydraulic parts.

  • Gerald Smallegange says:

    I need a repair kit for a 2003 John deer L120C Date Code 050103 (759936 62506 0)
    Can you tell me what repair kit I need and how I can order one.
    Transmission has lost power and will barely back up.

  • Jeff Zoerb says:

    I have model K46BN serial number 46BN001323, no power and no drive anything above half pedal in FWD directions, barely creeps in reverse direction. Took apart, oil looked clean and not filled with metal. Magnets had pretty good amount of goo on them. Also more noise from diff as hours accumulated. I’m assuming Center case with IDS Upgrade Kit good idea and recommended oil. Any other parts? Internal parts appeared to be in good shape still.

    • ggraham says:

      You would need a repair kit for your transmission. The kit comes with the pump and motor (both cylinder blocks), center case and seal kit. The part number is 1A646099591.

  • Jason Stuner says:

    Hello. I have a k57a transaxle with a bad pinion assembly. The parts are no longer available. How can I fix this without junking the whole machine since I just bought the rebuild kit for the transaxle.

  • Ricky Webb says:

    Will a transmission from a John Deere LA115 fit a L130? They look identical.

    • ggraham says:

      Though they look alike, swapping one for another is fraught with issues. It is not recommended. The transmissions are built for the specific tractor that they are installed in.

  • Ricky Webb says:

    Do you sell rebuild kit for a L130 AM131580 Hydrostatic Transmission?

  • James River says:

    My Husq mower (164hrs) went from smooth engagement to jerky engagement to NO engagement in about 15 minutes of use. I thought the boots I was wearing might be causing me to not feel the pedal. There is no resistance in the pedal and the brake stop has no grass under it. Can you give me an idea of what the problem could be or where I should start looking?

    • ggraham says:

      You should probably start with changing the oil in the transmission. Then you can check the pulley and input shaft to make sure they are right and all the linkages. Anything external can be checked with the oil change. After installing you can see if the unit is working better. If it is great. If not then it is time to rebuild or replace the transmission.

  • Shaun Coppersmith says:

    Wanted a price and part number for a k46 transmission. It’s a 40j or mia10910

  • Sam says:

    I have a john deere L120 with a (BAD) tuff torq k46 trans…….i have an opportunity to purchase a new in box k46 but its for a MTD Ser # 7A646084460. It looks the same but the axle shafts are different where/how the rear wheel attaches. Could the axle shafts from my l120 trans be swapped into the new K46 for the MTD.

    • ggraham says:

      Swapping transmissions can be very frustrating because of the differences in the various K46’s. Overcoming obstacles cannot be easily done. For instance, the two transmissions you stated have different logic. If you would put the new one in the tractor would go in reverse when you press the forward pedal. Axles aside I would not recommend using that transmission in your tractor.

  • Richie Moylan says:

    I am HP person disabled. I had someone rebuild my K46 tuff torq hydrostatic rebuild transmission kit. The man who did the job? Also change belt & both pedals bushings. John Deere x3oo tractor. Now the problem is tractor pedals forward going in reverse slow, reverse pedal now forward fast. Took transmission apart 2 times and check v block install correct. Please help spent my disability money to pay for tractor transmission. Help me please and thank you. Richie.

    • ggraham says:

      The wedge-shaped motor housing is installed wrong. It needs to be flipped 180 degrees. If the wide side is facing you then the thin side needs to be facing you.

  • Brian Foughty says:

    I have a John Deere LX277 with the K62 transaxle. It grinds when backing up but not going forward. it has plenty of pull going forward but appears to have less power when backing up. in your opinion what would I need to fix this problem?

  • mike L says:

    I have a k51 tranny need a rebuild kit . any idea on what kit I need thanks

  • Dick K says:

    I need a rebuild kit for a simplicity tuff torq k57 transaxle what part number would I need and a ball park cost

  • Charles Cothran Sr says:

    Gerry, HOP 405384 .. 7A646084108 … SN 468T0117071

  • Charles Cothran Sr says:

    I have a K46BT hydrostatic trans Axle. I need a rebuild kit to replace the drive gears on the axles.

  • gerry says:

    do you have or can you supply me with parts for tuff torq transaxle in ride on mowers

  • Craig cressman says:

    I have a lot 180 I need a pump kit the number is 746024021. 46-0146499 what number kit will work ? , don’t find any that match my numbers thank you

    • ggraham says:

      I believe that the number is 7A646024021? That would be a K46C transmission. The part number for a repair kit for that transmission is 1A646099581.

  • Darren Staples says:

    I have a K46 transaxle case PN 46BE0050278 SA646U84120 I took apart every thing looks great no shavings to speak of, it runs nice cold but when you go on any incline it stops, could it be the oil used it has about 300 hours when i drained the oil it seemed like there was not very much viscosity to the oil, The pump and motor seemed tightwith the plungers. can it get the tolerances for them please ty

    • ggraham says:

      The issue is not the pistons, usually. The issue is the other end of the cylinder block. You would want to check the metal between the kidney ports for scratches, scoring, or anything not flat. Also, the center case face should be glassy smooth. if it is not you are losing pressure between those two parts. Good oil can sometimes help that but it is not a guarantee.

  • roger w wilson says:

    I have a husqvarna lgt2654 with thek46aw transaxle in it. lately i’m having troble going up any kind of incline after the tractor is run for about 30 minutes. it runs fine up till then. i thought it was the main drive belt. i changed it, no improvement. do i need a repair kit of some kind

    • ggraham says:

      Yes, you will probably need to rebuild the transmission but the first step is changing the oil in the transmission. You can then check all the externals of the transmission to make sure nothing there is causing the issue. after the oil change, you can evaluate how the transmission is doing and then figure out if you need to rebuild it then.

  • Jim Maljaars says:

    Hello I have just purchased a used John Deere LTR166 rideon. The rear axle has just snapped off at the wheel hub. Is there a chance of replacing just the axle or do I need to purchase a complete new transmission? Thanks in advance!

    • ggraham says:

      The axles for the K46A which is installed in the LTR166 has an axle shaft kit. It comes with both axles, axle seals, gasket material, filter, sealing cap, and 3 litres of our 5W-50 synthetic oil. The part number is 1A646099731.

  • Rex says:

    Thanks ggraham! Here are all the numbers off the bar code on the transmission. Hopefully you can tell me which model it is as it may as well be Latin to me LOL! Thanks! TUFF TORQ 768T2024010 S/N: 4OJ-0223283 JDPP PN: AM134582
    Also…could you please tell me where I can get a transmission pump for this model.
    Thank you!!

  • Rodney Vaden says:

    Hello My name is Rodney. I have John deere G100. The transaxle will not pull on a including. It has 400+ hours on it. What rebuild kit works with this transaxle?

  • Mel Lucas says:

    I have a Model K45BA transaxle on a Craftsman lawnmower. What is the description/specifications of the belt that needs to be replaced?

    • ggraham says:

      I am sorry but we do not deal with the belts. we only deal with the parts of the transmission. anything that the OEMs install on the transmission or tractor is a part you would need to get from them.

    • ggraham says:

      Since we do not sell that part I do not have specifications for it. You would need to back to Sears for the belt.

  • Rex says:

    I have a K46 AM134582 in a John Deere LA120…A couple of questions please… How do I know which K46 model is it? IE, K46A or??
    Also, my pump is gone in it… where can I get a new one?
    Thanking you in advance!

    • ggraham says:

      You would need to check the serial number of the transmission. It is on a barcode sticker on the case of the transmission close to one of the axles and you should be able to see it from the rear of the tractor. The serial number will tell you specifically which transmission you have.

  • Eric A. says:

    I have a K46aw in my Husqvarna, I’m thinking of upgrading to a K57. Which one should I d use?

    • ggraham says:

      I do not have information for swapping out transmissions. That is for the simple fact that they are built for the specific tractor that they are installed in.

  • HAY DAVID says:

    Bonsoir j’ai un tracteur tondeuse toro avec une boite hydro K46 1A646024160 ou1A646024163 Je voudrais savoir si vous vendez un quite de réparation car il avence plus quand il est chaud merci de votre réponse

  • Richard Windon says:

    I have a Troy Bilt bronco I have transmission leak around left rear axle .Is it serviceable and can I get a seal for is 618-07009 the serial # looks like 7A646084600

    • ggraham says:

      Yes, you can change the seals in your transmission. Axle seal replacement this link takes you to the information online for how to do it. the part number for the seal is 187T0134280. There is a $25 minimum to order off of the website so you might want to use the distributor Gardner to order the seals. their number is 800.848.8946. And as always you can contact the helpful service techs at 866.572.3441 or email at

  • Gary Lansink says:

    I believe I have a K46 trans out of a JD LT125. It looked like it had oil coming from vent and was covered in debris when I got the mower. It has 198hrs on it. I took it out, cleaned it up and did an oil change. Seems like I was wrong. All wet around neutral/in gear shaft and couple drips on floor after 2 weeks sitting. Is there an o-ring around that shaft or?? I do not have the serial number off the axle at this time…

    • ggraham says:

      Yes, there is an oil seal on the control shaft. You get the serial number of the transmission and email it to and the helpful techs in the service department will get you the part number for that particular seal.

  • Larry Knoell says:

    Do you sell a repair kit for Tuff Torq K51A-SBR John Deere P/N 880202 ?

  • Gary harvey says:

    I have a hustler fastrak 42″. Do you guys sell a rebuild kit for the tranaxles or know of one? Or are they a disposable?

    • ggraham says:

      That looks like it has another company’s transmissions. You would need to check the serial number on the transmissions to get an idea about which company made them.

  • Dan says:

    what is the clearance specification for the clearance between the pistons and the pump and alos the pistons and the motor? I need the specs. so I can know if I need to order replacement parts when I change the oil and filter.

  • Kevin Rhodes says:

    Hi, Have a problem with a transmission in a John Deere Lawn Tractor/Rideon Mower.
    No Drive – Forward or Reverse until the brake pedal is pressed approx half way down.
    The mower has completed 426hrs.
    No noises come from the transmission and seems to drive smoothly.
    There are 3 Numbers on the Bar Code are :- 768T2024011 , MIA10910 & 40J-0858287.
    Any help greatly appreciated as located in country Queensland Australia and the nearest John Deere service agent is approx 80 mile away.

    • ggraham says:

      For questions like that, you can always contact the friendly techs in the Tuff Torq Service Department by Phone: 866.572.3441 and

  • Luís Henrique Silveira Pareja says:

    Moro no Brasil tenho um microtrator husqvarna com transmissão K46, mas não consigo saber o tempo de troca do óleo da mesma e o pior, que óleo utilizar, com isso ela foi ficando fraca. Um revendedor do trator me indicou óleo sintético 5 w50, não encontrei o mesmo, me mandaram colocar o 10w40 funciona por 1 hora e quando esquenta ficar fraca, espera esfriar e usa mais uma hora. Acabei por trocar a transmissão por outra nova e não sei como farei a manutenção da mesma. Se possível me indique o tempo de troca do óleo e um tipo de óleo que encontre no Brasil. Obrigado pela atenção.

    • ggraham says:

      Você gostaria de mudar o seu óleo a cada 150 a 200 horas. A menos que você esteja cortando terreno acidentado ou tenha colinas, então você pode querer cortar até 100 horas ou menos. E recomendamos um óleo sintético completo de 5W-50.

  • Tony nixon says:

    I am having trouble finding parts breakdown for a K46 transmission. I am hoping to get help here. The numbers on the transmission are IA 6460-89850 and IA 6460-24163. Looking forward to your response

    • ggraham says:

      Hello Mr. Nixon,
      The numbers you indicated are embossed on the cases. Those numbers are part numbers for the cases. You would need to check for a bar code sticker on the case close to one of the axles. That would have the serial number on it and armed with the serial number you can find all the information for your transmission on the website: As always, you can call the helpful techs at 866.572.3441 if you have more questions.

  • Graeme Currie says:

    Can I retrofit the limited slip to an existing k46 at the same time as repairing?

  • jerry woodward says:

    T he bypass shaft on my k51a tufftorq started leaking oil. how do I replace the new shaft with new one and put new O-rings 1a and p10a in. how do you get the old shaft out

  • Charlie Schmidt says:

    46BL0031685 unit works great cold, and not so good hot. can I rebuild this unit? what is the kit# and the cost. Can you tell me of a local fluid so I don’t have to have it shipped. Thank you, Charlie power equip center.

    • ggraham says:

      Hello Mr. Schmidt,
      You can rebuild it and a repair kit for this model is part number 1A646099591. You can look it up on our website to get pricing. Oil, however, is not easy to say because we have tested our oil exclusively now for a while and feel it is the best choice for longevity in your transmission. As always, you can call the helpful techs at the Service Department to have all your questions answered. The number is 866.572.3441.

  • Alan taylor says:

    Center case Service kit on a k46 transaxle

    • ggraham says:

      Hello Mr. Taylor,
      The center case is included in the repair kit for your particular transmission. You would need to order the whole kit to get the center case kit. As always you can always email the Service Department at or call at 866.572.3441. The techs there will be happy to answer your questions.

  • Steve Stuckey says:

    Can k66l be rebuit?

    • ggraham says:

      Hello, Mr. Stuckey,
      Yes, you can rebuild your K66I. To find the part number for the rebuild kit you would need the serial number off of the transmission. You can contact the Service Department at 866.572.3441, then for them to get you the right part number or you can look it up on the website as well.

  • Chris Foy says:

    I need a repair kit for a k46 Tuff Torq transmission
    SN: 46AC0184312

  • Donnie Brewer says:


    Reassemble k 51 a. Now forward is reverse and reverse is forward. What did i do wrong?

    • ggraham says:

      Mr. Brewer,
      There is a wedge shaped housing that holds the bearings for motor cylinder block. It is installed upside down. Flip that housing and it will work in forward and reverse. If you have any questions you can always call the Service Department at 866.572.3441

  • gary hindman says:

    hi David, after servicing my k58a it now goes backward instead of forward and forward instead of backward is there a way to fix this? or should I just turn the seat around. thanks Gary.

  • Bernard Hinde says:

    Hi , I have a k46 s/no. 461-0011025 ( husqvarna 506 9863-02 ) and one of the ids valves was stuck in . I managed to extract both but there
    was no ball bearing or filter in either , can you advise what is correct and pt. no. please ?
    I pulled it apart because the mower has lost a lot of power and all looks ok apart from the gears in the diff so I have an enquiry for those
    with a company here in New Zealand .

    • Hello Mr. Hinde. Thanks for your message. While I am happy to help any way I can, you have questions here that would be best answers by one of our service professionals. You can reach them at or toll-free at (866) 572-3441. If you contact our professional service team, they will be able to look up and help you with the repair of your K46 unit. Hope that is helpful, have a great day!

  • Richie Leonard says:

    Hi, I have a John Deer 115 which has the tuff torq drive unit and has lost all drive power. I was just wondering if it is worth repairing this by replacing the pump and motor kit or should I just scrap the complete machine. I’m not sure how much the repair kit is yet but I understand it is going to be quite expensive. (if the machine were working it would be worth about UK 450 pounds, aprox 550 USD).
    Any advice would be most appreciated
    Thanks Richie…

    • Hello, Mr. Leonard. Thanks for your comment. I think the best advice would be to contact our service team and let them review your issues and recommend the best solution. You can email them at or call them toll-free at +1 (866) 572-3441. I hope that is helpful! Have a great day.

  • Martin walyor says:

    Good to know

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